There are some people who believe that Bitcoin is the only blockchain based protocol which has value and that all others will fail. These people are known as Bitcoin maximalists and their belief is based on economics, specifically Austrian economics, and that the technology which is great for Bitcoin is not useful for anything else. I am more open minded and believe that there are other applications of the technology which will create sustainable ecosystems but I could be proved wrong here. It is important to spend time doing your own research and building up your own view on where the technology may be used.
Only invest what you can lose. During the recent crash in January 2018, hobby-investors got burned. Reports of frustration and losses came at the cost of broken monitors, smashed laptops, and heavy monetary losses. While the rules are in more particular order of importance, it’s safe to assume that this is the most important rule, the rule to rule the rules. As soon as your money is converted into cryptocurrency, consider it lost forever. There is absolutely no guarantee you can get it back. Losses don’t simply come from dips in the market; extraordinary factors such as hacks, bugs, and government regulation can mean you’ll never see any of your money again. If you are investing money you can’t afford to lose, you need to take a step back and re-evaluate your current financial situation, because what you’re about to do is an act of desperation. This includes: using credit cards, taking out mortgages, applying for loans, or selling everything and traveling the world (as glamorous as that sounds).